package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

/**
 * @version v1.0
 * @author OldGj 2024/5/16
 * @apiNote 用户相关业务层实现类
 */
@Slf4j
@Service
public class UserServiceImpl implements UserService {

    public static final String AUTHORIZATION_CODE = "authorization_code";
    private static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";


    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;

    /**
     * 用户微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User UserLogin(UserLoginDTO userLoginDTO) {
        // 调用微信提供的第三方接口获取用户的openid
        String openid = getOpenid(userLoginDTO.getCode());
        // 如果获取到的openid为null，则抛出业务异常
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        // 根据openid查询用户，如果查询成功，说明该用户非新用户，直接返回用户信息
        User user = userMapper.findByOpenid(openid);
        // 如果查询失败，说明该用户为新用户，需要完成注册功能
        if (user == null) {
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }
        return user;
    }

    /**
     * 调用第三方接口获取用户openid
     * @param code
     * @return
     */
    private String getOpenid(String code) {
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type", AUTHORIZATION_CODE);
        String body = HttpClientUtil.doGet(WX_LOGIN, map);
        JSONObject jsonObject = JSON.parseObject(body);
        return jsonObject.getString("openid");
    }
}
